Low memory problems in 8xx Linux

[Peter Allworth]

Jesper Skov wrote:

<snip>

> I read the patch and think I understand what's going on, but I don't
> see where the GUARDED bits comes in. Maybe I'm missing some subtlety
> from other patches (cllf?) and should not use the code at all. I'd
> better back it out.
>
> Jesper
>

Apologies for being vague. I have a head-cold and my brain seems to be
on vacation. :(

The guarded flag doesn't appear in the patch but in

cllf-2.2.13/arch/ppc/kernel/head.S
(from Dan's distribution for the Classic Lite Low Fat board)

near where the head.S-patch is applied.

Somewhere in the DataStoreTLBMiss routine, I think, you'll see the comment:

/* Insert the Guarded flag into the TWC from the Linux PTE.
<snip>
*/

This is one of the areas where cllf-2.2.13 differs from mpc8xx-2.2.13.

HTH,

PeterA.

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